Display device

Abstract

A display device includes a light source, a display panel, and an optical sheet. The light source includes a first light source substrate and a second light source substrate spaced apart from the first light source substrate in a width direction. The light source is loaded into a light source module, and a width of a region defined as a half of a maximum luminance of a light profile of the light source is set to a full width of a half maximum of the maximum luminance. A distance between a center of the first light source substrate in the width direction and a center of the second light source substrate in the width direction can be referred to as a pitch, and the full width at the half maximum of the maximum luminance of the light source and the pitch satisfy the following condition. 1.0 ≤ half maximum of maximum luminance full width / pitch ≤ 2.0.

Description

TECHNICAL FIELD

[0001] The disclosure relates to a display apparatus, and more particularly, to a display apparatus having an improved optical structure. BACKGROUND

[0002] A display apparatus is an output device that converts electrical information obtained or stored into visual information and displays the visual information to a user. The display apparatus is used in various fields, such as homes and commercial places.

[0003] The display apparatus generally includes a monitor apparatus connected to a personal computer or a server computer, a portable computer apparatus, a navigation terminal apparatus, a general-purpose television apparatus, an Internet protocol television (IPTV) apparatus, a portable terminal apparatus such as a smart phone, a tablet, a personal digital assistant (PDA), or a cellular phone, various display apparatuses for reproducing images such as advertisements or movies in industrial fields, or various audio / video systems.

[0004] The display apparatus includes a light source module that converts electrical information into visual information, and the light source module can include a plurality of light sources that independently emit light.

[0005] Each of the plurality of light sources includes, for example, a light emitting diode (LED) or an organic light emitting diode (OLED). For example, the LED or the OLED can be mounted on a circuit board or a substrate. SUMMARY

[0006] TECHNICAL PROBLEM

[0007] One aspect of the disclosure provides a display apparatus capable of reducing a moire phenomenon.

[0008] Another aspect of the disclosure provides a display apparatus capable of improving luminance.

[0009] TECHNICAL SOLUTION

[0010] According to one aspect of the disclosure, a display apparatus can include a light source configured to emit light; a display panel disposed in front of the light source and configured to output light emitted from the light source; an optical sheet disposed between the light source and the display panel; and a light source module disposed at a rear side of the optical sheet, wherein the light source module includes a first light source substrate having an elongated shape and a second light source substrate having an elongated shape and spaced apart from the first light source substrate in a width direction. The light source can be mounted on the light source module, wherein a width of an area defined by half of a maximum luminance of a light profile of an illumination element of the light source is set to a full width at half maximum luminance. A distance between a center of the first light source substrate in the width direction and a center of the second light source substrate in the width direction can be referred to as a pitch, and the full width at half maximum luminance of the light source and the pitch satisfy:

[0011] 1.0 ≤ full width at half maximum luminance / pitch ≤ 2.0.

[0012] The light source can include a first offset lighting element disposed on one side of the first light source substrate in the width direction, the first offset lighting element being spaced apart from the center of the first light source substrate in the width direction, and a second offset lighting element, the second offset lighting element can be disposed on the side opposite the first offset lighting element in the width direction of the first light source substrate, the second offset lighting element can be spaced apart from the center of the first light source substrate in the width direction and spaced apart from the first offset lighting element in the length direction of the first light source substrate.

[0013] The light source can include a first edge light source disposed adjacent to one end of the first light source substrate in the length direction and disposed at the center of the first light source substrate in the width direction, and a second edge light source disposed adjacent to the end of the first light source substrate opposite the first edge light source in the length direction and disposed at the center of the first light source substrate in the width direction.

[0014] The light source can include a first edge light source disposed adjacent to one end of the first light source substrate in the length direction and disposed at one side of the first light source substrate in the width direction, spaced apart from the center of the first light source substrate in the width direction, and a second edge light source disposed adjacent to the end of the first light source substrate opposite the first edge light source in the length direction and disposed at the side of the first light source substrate opposite the first edge light source in the width direction, spaced apart from the center of the first light source substrate in the width direction.

[0015] The light source can include a third offset lighting element disposed on the same line as the first offset lighting element and spaced apart from the first offset lighting element in the length direction of the first light source substrate, and a fourth offset lighting element disposed on the same line as the second offset lighting element and spaced apart from the second offset lighting element in the length direction of the first light source substrate.

[0016] The second offset lighting element can be disposed between the first offset lighting element and the third offset lighting element along the length direction of the first light source substrate, and the fourth offset lighting element is disposed on the side opposite the second offset lighting element from the third offset lighting element along the length direction of the first light source substrate.

[0017] The first offset lighting element and the third offset lighting element can be spaced apart from each other at a first interval in the length direction of the first light source substrate, and the second offset lighting element and the fourth offset lighting element can be spaced apart from each other at a second interval in the length direction of the first light source substrate and disposed at the center between the first offset lighting element and the third offset lighting element in the length direction of the first light source substrate, respectively.

[0018] The interval between the first bias lighting element and the second bias lighting element can be equal to the interval between the second bias lighting element and the third bias lighting element.

[0019] The spacing between the first bias lighting element and the second bias lighting element can be less than or equal to half the pitch.

[0020] The interval between the first bias lighting element and the second bias lighting element can be smaller than the interval between the second bias lighting element and the third bias lighting element.

[0021] The interval between the first bias lighting element and the second bias lighting element can be equal to the interval between the third bias lighting element and the fourth bias lighting element.

[0022] The display device may include a module substrate configured to transmit signals to a first light source substrate and a second light source substrate. The first light source substrate may be disposed on one side of the module substrate, and the light source module includes a third light source substrate disposed on the side of the module substrate opposite to the first light source substrate.

[0023] The display device may also include connectors configured to electrically connect the module substrate and the light source module.

[0024] The full width at half maximum luminance of the light source can be set to be greater than or equal to the interval between the first bias lighting element and the second bias lighting element.

[0025] The light source may include a light-emitting diode; and an optical dome configured to cover the light-emitting diode and made of silicone or epoxy resin.

[0026] According to another aspect of the disclosure, a display device can include a light source configured to emit light; a display panel disposed in front of the light source and configured to output light emitted from the light source; an optical sheet disposed between the light source and the display panel; and a light source module disposed at a rear side of the optical sheet, wherein the light source module includes a first light source substrate having an elongated shape and a second light source substrate having an elongated shape and spaced apart from the first light source substrate in a width direction. The light source can be mounted on the light source module, wherein a width of an area defined by half of a maximum luminance of a light profile of the light source is set to a full width of the half maximum luminance. A distance between a center of the first light source substrate in the width direction and a center of the second light source substrate in the width direction can be a pitch. The light source can include a first offset lighting element disposed on one side of the first light source substrate in the width direction, the first offset lighting element being spaced apart from the center of the first light source substrate in the width direction, and a second offset lighting element disposed on a side opposite the first offset lighting element of the first light source substrate in the width direction, the second offset lighting element being spaced apart from the center of the first light source substrate in the width direction and spaced apart from the first offset lighting element in a length direction of the first light source substrate. A spacing between the first offset lighting element and the second offset lighting element can be less than or equal to half of the pitch.

[0027] The light source can further include a third offset lighting element disposed on the same line as the first offset lighting element and spaced apart from the first offset lighting element in the length direction of the first light source substrate, and a fourth offset lighting element disposed on the same line as the second offset lighting element and spaced apart from the second offset lighting element in the length direction of the first light source substrate.

[0028] The spacing between the first offset lighting element and the second offset lighting element can be less than the spacing between the second offset lighting element and the third offset lighting element, and the spacing between the first offset lighting element and the second offset lighting element can be equal to the spacing between the third offset lighting element and the fourth offset lighting element.

[0029] The second offset lighting element can be disposed between the first offset lighting element and the third offset lighting element along the length direction of the first light source substrate, and the fourth offset lighting element can be disposed on a side opposite the second offset lighting element of the third offset lighting element along the length direction of the first light source substrate.

[0030] The first offset lighting element and the third offset lighting element can be spaced apart from each other at a first interval in the length direction of the first light source substrate, and the second offset lighting element and the fourth offset lighting element can be spaced apart from each other at a second interval in the length direction of the first light source substrate and disposed at centers between the first offset lighting element and the third offset lighting element, respectively, in the length direction of the first light source substrate.

[0031] Advantageous Effects

[0032] In a display apparatus according to an aspect of the disclosure, a ratio of a full width at half maximum (FWHM) of a light source to a distance between a plurality of light source substrates can satisfy a predetermined range, thereby reducing a moire phenomenon.

[0033] In a display apparatus according to an aspect of the disclosure, a ratio of a spacing between a plurality of light sources to a distance between a plurality of light source substrates can satisfy a predetermined range, thereby improving luminance. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a view illustrating an appearance of a display apparatus according to an embodiment.

[0035] Figure 2 is a view illustrating a display panel according to an embodiment. Figure 1 is an exploded view of the display apparatus illustrated in FIG. 1.

[0036] Figure 3 is a view illustrating a display panel according to an embodiment. Figure 2 is a view illustrating a display panel according to an embodiment.

[0037] Figure 4 is an exploded view of the light source apparatus illustrated in FIG. 3. Figure 2 is an exploded view of the light source apparatus illustrated in FIG. 3.

[0038] Figure 5 is a view illustrating a portion of a light source module according to an embodiment. Figure 4 is a view illustrating a portion of a light source module according to an embodiment.

[0039] Figure 6 is a schematic view of a light source module according to an embodiment. Figure 4 is a schematic view of a light source module according to an embodiment.

[0040] Figure 7 is a schematic view of a light profile of a light source according to an embodiment. Figure 5 is a schematic view of a light profile of a light source according to an embodiment.

[0041] Figure 8 is a view illustrating one of light source substrates of a light source apparatus according to an embodiment. Figure 5 is a view illustrating one of light source substrates of a light source apparatus according to an embodiment.

[0042] Figure 9 is a view illustrating one of light source substrates of a light source apparatus according to another embodiment.

[0043] Figure 10 is a view illustrating one of light source substrates of a light source apparatus according to yet another embodiment.

[0044] Figure 11 is a view illustrating experimental results when a ratio of a full width at half maximum of a light source of a light source apparatus to a spacing between a plurality of light source substrates deviates from a range of the disclosure.

[0045] Figure 12 is a view showing experimental results when a ratio of a full width at half maximum of a light source of a light source apparatus to a spacing between a plurality of light source substrates is within a range of the present invention. DETAILED DESCRIPTION

[0046] Throughout the specification, like reference numerals refer to like elements. The present specification does not describe all the components of the embodiments, and well-known descriptions in the technical field to which the present invention pertains and redundant descriptions between the embodiments will be omitted. The terms such as "unit", "module", "member", and "block" used herein can be implemented as software or hardware, and according to the embodiments, a plurality of "units", "modules", "members", and "blocks" can be implemented as a single component, or a single "unit", "module", "member", or "block" can include a plurality of components.

[0047] Throughout the specification, when a component is referred to as being "connected" to other components, it includes not only a case where the component is directly connected to the other components, but also a case where the component is indirectly connected through a wireless communication network.

[0048] It should be understood that the terms "include", "comprise", "consist of", and / or "consist essentially of", when used herein, specify the presence of stated elements, but do not preclude the presence or addition of one or more other elements, unless otherwise specified herein. As used herein, the term "unit" or "module" means an entity for performing at least one function or operation, and can be implemented as hardware, software, or a combination of hardware and software.

[0049] Throughout the specification, when a member is referred to as being "on" another member, the description includes not only when the member is in contact with the other member, but also when there is still another member present between the member and the other member.

[0050] The terms "first", "second", and the like are used to distinguish one component from other components, and the components are not limited by the terms.

[0051] The singular form includes the plural form, unless the context clearly dictates otherwise.

[0052] For ease of description, reference numerals attached to each operation are used, and the reference numerals do not describe the order of operations, and unless explicitly specified in the context, the operations can be performed in an order different from that described.

[0053] Hereinafter, the principle of operation and embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0054] Figure 1 is a view showing the appearance of a display apparatus according to an embodiment.

[0055] Display device 10 is a device capable of processing image signals received from an external source and visually displaying the processed image. In the following description, the display device 10 is illustrated as a television (TV), but this disclosure is not limited thereto. For example, display device 10 can be implemented in various forms, such as a monitor, a portable multimedia device, and a portable communication device, and the form of display device 10 is not limited, as long as the display device visually displays an image.

[0056] Furthermore, the display device 10 can be a large format display (LFD) installed outdoors, such as on the roof of a building or at a bus stop. Here, "outdoor" is not necessarily limited to the outdoors, and according to one embodiment, the display device 10 can be installed anywhere where a large number of people may enter and exit, even indoors, such as subway stations, shopping malls, cinemas, companies, and shops.

[0057] Display device 10 can receive content data, including video and audio data, from various content sources and output video and audio data corresponding to the video and audio data. For example, display device 10 can receive content data via a broadcast receiving antenna or wired cable, receive content data from a content playback device, or receive content data from a content provider's content delivery server.

[0058] like Figure 1 As shown, the display device 10 may include a main body 11, a screen 12 for displaying image I, and a support member 19 disposed below the main body 11 to support the main body 11.

[0059] The main body 11 may form the exterior of the display device 10, and the main body 11 may include components configured to allow the display device 10 to display image I or components configured to perform various functions. Figure 1 The main body 11 shown has a flat plate shape, but the shape of the main body 11 is not limited to... Figure 1 The shape shown. For example, the body 11 can have the shape of a curved plate.

[0060] Screen 12 can be formed on the front surface of the main body 11 and can display image I. For example, screen 12 can display still images or videos. In addition, screen 12 can display two-dimensional planar images or three-dimensional stereoscopic images using the user's binocular parallax.

[0061] The screen 12 may include, for example, a self-emissive panel that can emit light itself (e.g., a light-emitting diode (LED) panel or an organic light-emitting diode (OLED) panel) or a non-self-emissive panel (e.g., a liquid crystal panel) that can transmit or block light emitted by a light source device (e.g., a backlight unit).

[0062] Multiple pixels P can be formed on screen 12, and the image I displayed on screen 12 can be formed by light emitted from each of the multiple pixels P. For example, image I can be formed on screen 12 by combining the light emitted from the multiple pixels P like a mosaic.

[0063] Each of the multiple pixels P can emit light of various brightness and color. To emit light of various colors, each of the multiple pixels P can include sub-pixels P. R P G and P B .

[0064] Sub-pixel P R P G and P B It can include a red sub-pixel P that can emit red light. R Green sub-pixels P that can emit green light G And blue sub-pixels P that can emit blue light B For example, red light can represent light with wavelengths from approximately 620 nm (nanometer, one billionth of a meter) to 750 nm, green light can represent light with wavelengths from approximately 495 nm to 570 nm, and blue light can represent light with wavelengths from approximately 450 nm to 495 nm.

[0065] By combining the red sub-pixel P R Red light, green sub-pixels P G Green light and blue sub-pixels P B The blue light emitted by the multiple pixels P can each emit light of varying brightness and color.

[0066] Figure 2 According to the embodiments Figure 1 An exploded view of the display device shown.

[0067] like Figure 2 As shown, various components for generating image I on screen 12 can be arranged in the main body 11.

[0068] For example, the main body 11 may include a light source device 100 as a surface light source, a display panel 20 configured to block or transmit light emitted from the light source device 100, a control component 50 configured to control the operation of the light source device 100 and the display panel 20, and a power supply component 60 configured to supply power to the light source device 100 and the display panel 20. Furthermore, the main body 11 may include a frame 13, a frame inner mold 14, a bottom chassis 15, and a rear cover 16 for supporting and fixing the display panel 20, the light source device 100, the control component 50, and the power supply component 60.

[0069] The light source apparatus 100 can include a point light source that emits monochromatic light or white light, and can refract, reflect, and scatter light to convert light emitted from the point light source into uniform surface light. For example, the light source apparatus 100 can include a plurality of light sources configured to emit monochromatic light or white light, a diffusion plate configured to diffuse light incident from the plurality of light sources, a reflection sheet configured to reflect light emitted from the rear surface of the diffusion plate and the plurality of light sources, and an optical sheet configured to refract and scatter light emitted from the front surface of the diffusion plate.

[0070] As such, the light source apparatus 100 can emit uniform surface light toward the front by refracting, reflecting, and scattering light emitted from the light source.

[0071] The configuration of the light source apparatus 100 will be described in greater detail below.

[0072] Figure 3 is a view illustrating a cross-section of a display panel according to an embodiment. Figure 2 is a view illustrating a cross-section of a display panel according to an embodiment.

[0073] The display panel 20 can be disposed in front of the light source apparatus 100, and can block or transmit light emitted from the light source apparatus 100 to form an image I.

[0074] The front surface of the display panel 20 can form the screen 12 of the display apparatus 10 described above, and the display panel 20 can include a plurality of pixels P. The plurality of pixels P included in the display panel 20 can independently block or transmit light emitted from the light source apparatus 100, and light transmitted by the plurality of pixels P can form an image I to be displayed on the screen 12.

[0075] For example, as shown in Figure 3 , the display panel 20 can include a first polarizing film 21, a first transparent substrate 22, a pixel electrode 23, a thin film transistor (TFT) 24, a liquid crystal layer 25, a common electrode 26, a color filter 27, a second transparent substrate 28, and a second polarizing film 29.

[0076] The first and second transparent substrates 22 and 28 can fixedly support the pixel electrode 23, the thin film transistor 24, the liquid crystal layer 25, the common electrode 26, and the color filter 27. The first and second transparent substrates 22 and 28 can be made of tempered glass or transparent resin.

[0077] The first and second polarizing films 21 and 29 can be disposed on the outer sides of the first and second transparent substrates 22 and 28, respectively.

[0078] The first and second polarizing films 21 and 29 can be respectively disposed on the outer sides of the first and second transparent substrates 22 and 28. The first and second polarizing films 21 and 29 can respectively transmit a specific polarized light and block (reflect or absorb) another polarized light. For example, the first polarizing film 21 can transmit light polarized in a first direction and block (reflect or absorb) another polarized light. Also, the second polarizing film 29 can transmit light polarized in a second direction and block (reflect or absorb) another polarized light. In this case, the first and second directions can be orthogonal to each other. Thus, the polarized light passing through the first polarizing film 21 can not directly pass through the second polarizing film 29.

[0079] The color filter 27 can be disposed on the inner side of the second transparent substrate 28. The color filter 27 can include a red color filter 27R configured to transmit red light, a green color filter 27G configured to transmit green light, and a blue color filter 27B configured to transmit blue light. Also, the red, green, and blue color filters 27R, 27G, and 27B can be disposed in parallel to each other. The area in which the color filter 27 is formed can correspond to the above-described pixel P. The area in which the red color filter 27R is formed can correspond to the red sub-pixel P R , the area in which the green color filter 27G is formed can correspond to the green sub-pixel P G , and the area in which the blue color filter 27B is formed can correspond to the blue sub-pixel P B .

[0080] The pixel electrode 23 can be disposed on the inner side of the first transparent substrate 22, and the common electrode 26 can be disposed on the inner side of the second transparent substrate 28. The pixel electrode 23 and the common electrode 26 can be made of a conductive metal material, and can generate an electric field for changing the alignment of liquid crystal molecules 115a constituting the liquid crystal layer 25 to be described below.

[0081] The thin film transistor 24 can be disposed on the inner side of the first transparent substrate 22. The thin film transistor 24 can be turned on (closed) or turned off (open) by image data provided by the panel driver 30. Also, by turning on (closed) or turning off (open) the thin film transistor 24, an electric field can be formed between the pixel electrode 23 and the common electrode 26 or removed from between the pixel electrode 23 and the common electrode 26.

[0082] The liquid crystal layer 25 can be formed between the pixel electrode 23 and the common electrode 26, and can be filled with liquid crystal molecules 25a. Liquid crystal represents an intermediate state between a solid (crystal) and a liquid. Liquid crystal can exhibit optical properties according to changes in an electric field. For example, the alignment direction of molecules constituting liquid crystal can change according to changes in an electric field. Accordingly, the optical properties of the liquid crystal layer 25 can change according to the presence or absence of an electric field passing through the liquid crystal layer 25. For example, the liquid crystal layer 25 can rotate the polarization direction of light around an optical axis according to the presence or absence of an electric field. Accordingly, polarized light that has passed through the first polarizing film 21 can change the polarization direction while passing through the liquid crystal layer 25, and can pass through the second polarizing film 29.

[0083] The image data is transmitted to the display panel 20 through a cable 20a, and a display driver integrated circuit (DDI) 30 (hereinafter referred to as a "panel driver") is configured to process digital image data and output an analog image signal, the cable 20a and the display driver integrated circuit 30 (hereinafter referred to as a "panel driver") being disposed at one side of the display panel 20.

[0084] The cable 20a can be electrically connected between the control component 50 / power supply component 60 and the panel driver 30, or can be electrically connected between the panel driver 30 and the display panel 20. The cable 20a can include a flexible flat cable that is bendable, a film cable, or the like.

[0085] The panel driver 30 can receive image data and power from the control component 50 / power supply component 60 through the cable 20a. In addition, the panel driver 30 can provide image data and a driving current to the display panel 20 through the cable 20a.

[0086] In addition, the cable 20a and the panel driver 30 can be implemented integrally as a film cable, a chip on film (COF), a tape carrier package (TCP), or the like. In other words, the panel driver 30 can be disposed on the cable 20a. However, the present disclosure is not limited thereto, and the panel driver 30 can be disposed on the display panel 20.

[0087] The control component 50 can include a control circuit configured to control the operation of the display panel 20 and the light source apparatus 100. The control circuit can process image data received from an external content source, transmit the image data to the display panel 20, and transmit dimming data to the light source apparatus 100.

[0088] The power supply component 60 can include a power supply circuit configured to supply power to the display panel 20 and the light source apparatus 100. The power supply circuit can supply power to the control component 50, the light source apparatus 100, and the display panel 20.

[0089] The control assembly 50 and the power supply assembly 60 can be implemented with a printed circuit board and various circuits mounted on the printed circuit board. For example, the power supply circuit can include capacitors, coils, resistive elements, a processor, etc., as well as a power supply circuit board on which these elements are mounted. Also, the control circuit can include a memory, a processor, and a control circuit board on which these elements are mounted.

[0090] Figure 4 is an exploded view of a light source apparatus according to an embodiment. Figure 2 Figure 5 is a partial enlarged view of a light source module according to an embodiment. Figure 4

[0091] The light source apparatus 100 can include a light source module 110 configured to generate light, a reflection sheet 120 configured to reflect light, a diffusion plate 130 configured to uniformly diffuse light, and an optical sheet 140 configured to improve the brightness of emitted light.

[0092] The light source module 110 can include a plurality of light sources 111 (or illumination elements) configured to emit light and a light source substrate 112 (or a light source module) configured to support / fix the plurality of light sources 111.

[0093] The plurality of light sources 111 can be disposed in a predetermined pattern to allow the emitted light to have uniform brightness. The plurality of light sources 111 can be disposed such that the interval between one light source and an adjacent light source becomes equal to each other. Alternatively, the plurality of light sources 111 can be disposed such that the interval between one light source and an adjacent light source becomes different from each other.

[0094] The light source 111 can employ an element configured to emit monochromatic light (light having a specific wavelength range or light having one peak wavelength, such as blue light) or white light (i.e., light having a plurality of peak wavelengths, such as a mixed light of red light, green light, and blue light) in different directions when powered.

[0095] As shown in Figure 5 Each of the plurality of light sources 111 can include a light emitting diode 190 and an optical dome 180.

[0096] In order to reduce the thickness of the display apparatus 10, the thickness of the light source apparatus 100 can also be reduced. In order to reduce the thickness of the light source apparatus 100, each of the plurality of light sources 111 is thinned and its structure is simplified.

[0097] The light emitting diode 190 can be directly attached to the light source substrate 112 in a chip on board (COB) manner. For example, the light source 111 can include a light emitting diode 190 in which an LED chip or an LED die is directly attached to the light source substrate 112 without a separate package.

[0098] ​​The light emitting diode 190 can be manufactured as a flip chip type light emitting diode. In the flip chip type light emitting diode 190, when the light emitting diode as a semiconductor element is attached to the light source substrate 112, no intermediate medium such as a metal lead (wire) or a ball grid array (BGA) is used, and an electrode pattern of the semiconductor element can be directly fused to the light source substrate 112. Thus, the light source 111 including the flip chip type light emitting diode 190 can be miniaturized since the metal lead (wire) or the BGA is omitted.

[0099] The flip chip type light emitting diode 190 directly fused to the light source substrate 112 in the COB manner has been described above, but the light source 111 is not limited to the flip chip type light emitting diode. For example, the light source 111 can include a package type light emitting diode.

[0100] The optical dome 180 can cover the light emitting diode 190. The optical dome 180 can prevent or inhibit damage to the light emitting diode 190 due to external mechanical action and / or damage to the light emitting diode 190 due to chemical action.

[0101] The optical dome 180 can have a dome shape obtained by cutting a sphere along a plane not including the center thereof, for example, or can have a semi-spherical shape obtained by cutting a sphere along a plane including the center thereof. A vertical cross section of the optical dome 180 can have, for example, an arc shape or a semi-circular shape.

[0102] The optical dome 180 can be made of silicone or epoxy resin. For example, molten silicone or molten epoxy resin can be sprayed onto the light emitting diode 190 through a nozzle or the like, and then the sprayed silicone or epoxy resin can be cured to form the optical dome 180.

[0103] The optical dome 180 can have a diameter of about 10 mm or less and a height of about 5 mm or less. According to an embodiment, the optical dome 180 can have a diameter of about 3 mm or less and a height of about 1 mm or less.

[0104] The optical dome 180 can be optically transparent or translucent. Light emitted from the light emitting diode 190 can be emitted to the outside through the optical dome 180.

[0105] The dome-shaped optical dome 180 can refract light like a lens. For example, light emitted from the light emitting diode 190 can be diffused by being refracted by the optical dome 180.

[0106] Thus, the optical dome 180 can protect the light emitting diode 190 from external mechanical action and / or chemical or electrical action, as well as diffuse light emitted from the light emitting diode 190.

[0107] Although the optical dome 180 in the form of a silicone dome has been described above, the light source 111 is not limited to include the optical dome 180. For example, the light source 111 can include a lens to diffuse light emitted from the light emitting diode.

[0108] The light source substrate 112 can fix the plurality of light sources 111 such that the position of each of the light sources 111 is constant. Also, the light source substrate 112 can supply power to each of the light sources 111 to emit light.

[0109] The light source substrate 112 can be formed of synthetic resin or tempered glass in which a conductive power line is formed, or a printed circuit board (PCB) to fix the plurality of light sources 111 and supply power to the light sources 111.

[0110] The reflective sheet 120 can reflect light emitted from the plurality of light sources 111 in a forward direction or a direction close to the forward direction.

[0111] A plurality of through-holes 120a can be formed in the reflective sheet 120 to correspond to the positions of the plurality of light sources 111 of the light source module 110, respectively. Also, the light sources 111 of the light source module 110 can pass through the through-holes 120a and protrude forward from the reflective sheet 120, respectively. Accordingly, the plurality of light sources 111 can each emit light forward from the reflective sheet 120. The reflective sheet 120 can reflect light emitted from the plurality of light sources 111 toward the diffusing plate 130.

[0112] The diffusing plate 130 can be disposed in front of the light source module 110 and the reflective sheet 120, and can uniformly diffuse light emitted from the light sources 111 of the light source module 110.

[0113] As described above, the plurality of light sources 111 can be located at a plurality of positions in the rear surface of the light source apparatus 100. Although the plurality of light sources 111 can be disposed at regular intervals on the rear surface of the light source apparatus 100, the non-uniformity of brightness can depend on the positions of the plurality of light sources 111.

[0114] The diffusing plate 130 can diffuse light emitted from the plurality of light sources 111 in the diffusing plate 130 to eliminate the non-uniformity of brightness due to the plurality of light sources 111. In other words, the diffusing plate 130 can uniformly emit non-uniform light of the plurality of light sources 111 in the forward direction.

[0115] The optical sheet 140 can include various sheets to improve brightness or uniformity of brightness. For example, the optical sheet 140 can include a light conversion sheet 141, a diffusing sheet 142, a prism sheet 143, a reflective polarizing sheet 144, etc.

[0116] The optical sheet 140 is not limited to Figure 4 the sheets or films illustrated, and can include more different sheets or films, such as a protective sheet.

[0117] Figure 6 According to the embodiments Figure 4 The diagram shows the light source module. Figure 7 According to the embodiments Figure 5 A schematic diagram of the light profile of the light source shown. Figure 8 An example is shown. Figure 5 One of the light source substrates in the process.

[0118] refer to Figure 6 The light source module 110 may include a module substrate 116. The module substrate 116 may be configured to send signals to the light source substrate 112. The module substrate 116 may be electrically connected to the control component 50 and / or the power supply component 60. The module substrate 116 may be formed of synthetic resin or tempered glass with conductive power lines formed thereon, or may be formed of a PCB to supply power to the light source 111.

[0119] The module substrate 116 may have a strip shape. The module substrate 116 may have a length-direction ( Figure 4 The longer side (vertical direction) and the side along the width direction in the coordinate system shown. Figure 4 The shorter side in the left and right directions of the coordinate system shown.

[0120] refer to Figure 6 The light source module 110 may include connectors 117. Each connector 117 may be configured to electrically connect a light source substrate 112 to a module substrate 116. The connectors 117 may be configured to correspond to a plurality of light source substrates 112 respectively.

[0121] refer to Figure 6 The light source module 110 may include a light source substrate 112. The light source substrate 112 may have a strip shape. The light source substrate 112 may have a shape along its length direction ( Figure 4 The longer side (in the left-right direction of the coordinate system shown) and the side along the width direction ( Figure 4 The short side (vertical direction in the coordinate system shown). The light source substrate 112 may include a plurality of light source substrates 112 continuously arranged along the two long sides of the module substrate 116.

[0122] Multiple light source substrates 112 can be configured to be spaced apart from each other at predetermined intervals in the width direction of the light source substrates 112. As an example, a first light source substrate 112a can be configured to be spaced apart from a second light source substrate 112b in the vertical direction. Specifically, the first light source substrate 112a can be configured such that the imaginary center line L of the first light source substrate 112a in the width direction (see...) Figure 8 The distance P between the imaginary center line L in the width direction of the second light source substrate 112b and the second light source substrate 112b is 1.

[0123] The plurality of light source substrates 112 can be disposed to be spaced apart from each other at predetermined intervals in the length direction of the light source substrate 112. As an example, the first light source substrate 112a can be disposed to be spaced apart from the third light source substrate 112c in the left-right direction. The first light source substrate 112a can be disposed on the left side of the module substrate 116, and the third light source substrate 112c can be disposed on the right side of the module substrate 116.

[0124] Referring to Figure 7 In each of the plurality of light sources 111 disposed on the light source substrate 112, the width of the region defined by half of the maximum luminance (in the front direction of the light emitting diode 190) of the light profile F is set to the full width of half of the maximum luminance W.

[0125] In the light source apparatus 100 according to the embodiment of the disclosure, the interval P between the center line L of each of the first light source substrate 112a and the second light source substrate 112b and the full width of the half maximum luminance of the light source 111 can satisfy the relational expression shown in Equation 1 below,

[0126] [Equation 1]

[0127] 1.0 <= Full width of half maximum luminance W / interval P <= 2.0

[0128] Referring to Figure 8 The plurality of light sources 111 can include a first bias light source 111a and a second bias light source 111b. The bias light source can also be referred to as a bias illumination element.

[0129] The first bias light source 111a can be disposed on one side spaced apart from the imaginary center line L of the light source substrate 112 in the width direction with respect to the imaginary center line L. The first bias light source 111a can be disposed on the upper side spaced apart from the imaginary center line L of the light source substrate 112 in the width direction with respect to the imaginary center line L.

[0130] The second bias light source 111b can be disposed on the other side spaced apart from the imaginary center line L of the light source substrate 112 in the width direction with respect to the imaginary center line L. The second bias light source 111b can be disposed on the lower side spaced apart from the imaginary center line L of the light source substrate 112 in the width direction with respect to the imaginary center line L. The second bias light source 111b can be disposed to be spaced apart from the first bias light source 111a in the length direction of the light source substrate 112. That is, the second bias light source 111b can be disposed on the lower left of the first bias light source 111a.

[0131] Referring to Figure 7The interval D between the first bias light source 111a and the second bias light source 111b can be set to be equal to the full width W of the half maximum luminance of the plurality of light sources 111. The interval D between the first bias light source 111a and the second bias light source 111b can be set to be less than the full width W of the half maximum luminance of the plurality of light sources 111.

[0132] The interval D between the plurality of light sources 111 and the pitch P (which is the distance between the centers of the plurality of light source substrates 112 in the width direction) can satisfy the relationship shown in Equation 2 below,

[0133] [Equation 2]

[0134] Interval D <= 0.5 * Pitch P

[0135] In other words, in the display device 10 according to the embodiment of the disclosure, the plurality of light sources 111 can be disposed such that the interval D between the plurality of light sources 111 is less than half of the pitch P, which is the distance between the centers of the plurality of light source substrates 112 in the width direction. With such a configuration, the display device 10 according to the embodiment of the disclosure can allow the luminance to be improved.

[0136] Reference Figure 8 The plurality of light sources 111 can include a third bias light source 111c disposed on the same line as the first bias light source 111a in the length direction of the light source substrate 112. The third bias light source 111c can be disposed to be spaced apart from the first bias light source 111a in the length direction of the light source substrate 112.

[0137] The plurality of light sources 111 can include a fourth bias light source 111d disposed on the same line as the second bias light source 111b in the length direction of the light source substrate 112. The fourth bias light source 111d can be disposed to be spaced apart from the second bias light source 111b in the length direction of the light source substrate 112. The fourth bias light source 111d can be disposed to be spaced apart from the third bias light source 111c in the length direction of the light source substrate 112. That is, the fourth bias light source 111d can be disposed below and to the left of the third bias light source 111c.

[0138] The interval between the first bias light source 111a and the second bias light source 111b can be equal to the interval between the third bias light source 111c and the fourth bias light source 111d.

[0139] The interval between the second bias light source 111b and the first bias light source 111a can be equal to the interval between the second bias light source 111b and the third bias light source 111c.

[0140] The plurality of light sources 111 can be provided in a manner in which the first to fourth offset light sources 111a to 111d are repeated. The number of the plurality of light sources 111 provided on the light source substrate 112 can be based on an application.

[0141] The plurality of light sources 111 can include a first edge light source 111e disposed adjacent to one end of the light source substrate 112 in a length direction. The first edge light source 111e can be disposed on a right side end portion of the light source substrate 112. The first edge light source 111e can be disposed at a center of the light source substrate 112 in a width direction.

[0142] The plurality of light sources 111 can include a second edge light source 111f disposed adjacent to the other end of the light source substrate 112 in the length direction. The second edge light source 111f can be disposed on a left side end portion of the light source substrate 112. The second edge light source 111f can be disposed at the center of the light source substrate 112 in the width direction.

[0143] Since the first edge light source 111e and the second edge light source 111f are disposed on the imaginary center line L on the light source substrate 112 in the width direction, in the display apparatus 10 according to one embodiment of the disclosure, the luminance uniformity of the edge portion of the screen 12 can be improved.

[0144] In the above description, for convenience of description, only the first offset light source 111a, the second offset light source 111b, the third offset light source 111c, and the fourth offset light source 111d are described, but the first offset light source 111a, the second offset light source 111b, the third offset light source 111c, and the fourth offset light source 111d can be alternately and continuously disposed along the length direction of the light source substrate 112.

[0145] Figure 9 FIG. 1 is a view showing one of light source substrates of a light source apparatus according to another embodiment.

[0146] Referring to Figure 9 , the light source apparatus 110' can include a first offset light source 111a', a second offset light source 111b', a third offset light source 111c', and a fourth offset light source 111d'. The first offset light source 111a', the second offset light source 111b', the third offset light source 111c', and the fourth offset light source 111d' can be provided in the same manner as the first offset light source 111a, the second offset light source 111b, the third offset light source 111c, and the fourth offset light source 111d shown in FIG. 1. Figure 8

[0147] The light source apparatus 110' can include a first edge light source 111e' and a second edge light source 111f'.

[0148] ​The first edge light source 111e' can be disposed adjacent to one end of the light source substrate 112 in the length direction. The first edge light source 111e' can be disposed on the right side end portion of the light source substrate 112.

[0149] With the described embodiment, the first edge light source 111e' can be disposed on the same line as the first bias light source 111a' in the length direction of the light source substrate 112. Figure 8 Unlike the described embodiment, the first edge light source 111e' can be disposed on the other side from the center of the light source substrate 112 in the width direction. The first edge light source 111e' can be disposed on the upper side from the imaginary center line L of the light source substrate 112 in the width direction.

[0150] The second edge light source 111f' can be disposed adjacent to the other end of the light source substrate 112 in the length direction. The second edge light source 111f' can be disposed on the left side end portion of the light source substrate 112.

[0151] With the described embodiment, the second edge light source 111f' can be disposed on the same line as the second bias light source 111b' in the length direction of the light source substrate 112. Figure 8 Unlike the described embodiment, the second edge light source 111f' can be disposed on the other side from the center of the light source substrate 112 in the width direction. The second edge light source 111f can be disposed on the lower side from the imaginary center line L of the light source substrate 112 in the width direction.

[0152] When the first edge light source 111e' and the second edge light source 111f' are disposed to be spaced apart from the imaginary center line L of the light source substrate 112 in the width direction, the first edge light source 111e' and the second edge light source 111f' can be disposed to be closer to the reference Figure 8 The described embodiment is closer to the bezel 13 in order to improve the luminance uniformity of the edge portion of the screen 12.

[0153] Figure 10 FIG. 7 is a view showing a light source substrate of a light source apparatus according to still another embodiment.

[0154] With reference to Figure 10 The light source apparatus 100" according to still another embodiment of the disclosure can include a first bias light source 111a", a second bias light source 111b", a third bias light source 111c", a fourth bias light source 111d", and a fifth bias light source 111g".

[0155] The fifth bias light source 111g" can be disposed on the same line as the first bias light source 111a" and the third bias light source 111c", spaced apart therefrom in the length direction of the light source substrate.

[0156] The light source apparatus 100” can include a first edge light source 111e” and a second edge light source 111f”. The first edge light source 111e” and the second edge light source 111f” can be disposed to be spaced apart from the imaginary center line L of the light source substrate 112 in the length direction, as shown in the first edge light source 111e’ and the second edge light source 111f’. Figure 9

[0157] The interval d1 between the first bias light source 111a” and the second bias light source 111b” can be equal to the interval d3 between the third bias light source 111c” and the fourth bias light source 111d”. The interval d2 between the second bias light source 111b” and the third bias light source 111c” can be equal to the interval d4 between the fourth bias light source 111d” and the fifth bias light source 111g”.

[0158] Unlike the embodiment of Figure 8 , the interval d1 between the second bias light source 111b” and the first bias light source 111a” can be less than the interval d2 between the second bias light source 111b” and the third bias light source 111c”. That is, the first bias light source 111a” and the second bias light source 111b” can be grouped to emit light as one light source, and the third bias light source 111c” and the fourth bias light source 111d” can be grouped to emit light as one light source. Through such a configuration, when the light source apparatus 100” is applied to the display apparatus 10, the brightness uniformity can be improved.

[0159] Figure 11 is a graph showing experimental results when the ratio of the full width at half maximum luminance of the light source of the light source apparatus to the interval between the plurality of light source substrates exceeds the range of the present disclosure. Figure 12 is a graph showing experimental results when the ratio of the full width at half maximum luminance of the light source of the light source apparatus to the interval between the plurality of light source substrates is within the range of Equation 1.

[0160] The effects of the display apparatus 10 will be described with reference to Figure 11 and 12 .

[0161] With reference to Figure 11 , when the ratio of the full width at half maximum luminance W of the light source 111 of the light source module 110, 110’, or 110” to the interval P (which is the distance between the centers of the plurality of light source substrates 112 in the width direction) exceeds the range of Equation 1, the Moire phenomenon occurs.

[0162] In particular, when the full width W / interval P of the half maximum luminance is less than 1.0, the Moire phenomenon is more likely to occur.

[0163] ​On the contrary, when the full width W at half maximum luminance to pitch P is greater than 2.0, the Moire phenomenon can be reduced, but the increase in the number of light source substrates 112 required results in an increase in cost.

[0164] However, with reference to Figure 12 When the ratio of the full width W at half maximum luminance to the pitch P (which is the distance between the centers of the plurality of light source substrates 112 in the width direction) of the light source 111 of the light source apparatus 100, 100', or 100" satisfies the range of Equation 1, the Moire phenomenon can be reduced.

[0165] Here, the disclosed embodiments have been described with reference to the accompanying drawings. It will be understood by those skilled in the art that other forms different from the disclosed embodiments can be implemented without departing from the technical spirit and essential characteristics of the disclosed embodiments. The disclosed embodiments are illustrative and should not be construed as limiting.

Claims

1. A display apparatus comprising: a light source configured to emit light; a display panel disposed in front of the light source and configured to output light emitted from the light source; an optical sheet disposed between the light source and the display panel; and a light source module disposed at a rear side of the optical sheet, wherein the light source module includes a first light source substrate having an elongated shape and a second light source substrate having an elongated shape and spaced apart from the first light source substrate in a width direction, wherein the light source is mounted on the light source module, wherein a width of a region defined by half of a maximum luminance of a light profile of an illumination element of the light source is set to a full width at half maximum luminance, and wherein a distance between a center of the first light source substrate in the width direction and a center of the second light source substrate in the width direction is a pitch, the full width at half maximum luminance of the light source and the pitch satisfy: 1.0 ≤ full width at half maximum luminance / pitch ≤ 2.

0. the light source includes a first offset illumination element disposed on one side of the first light source substrate in the width direction, the first offset illumination element being spaced apart from the center of the first light source substrate in the width direction, and 2. The display device of claim 1, wherein, a second offset illumination element disposed on a side opposite the first offset illumination element of the first light source substrate in the width direction, the second offset illumination element being spaced apart from the center of the first light source substrate in the width direction and spaced apart from the first offset illumination element in a length direction of the first light source substrate. the light source includes a first edge light source disposed adjacent to one end of the first light source substrate in the length direction and disposed at the center of the first light source substrate in the width direction, and 3. The display device of claim 2, wherein, a second edge light source disposed adjacent to an end of the first light source substrate opposite the first edge light source in the length direction and disposed at the center of the first light source substrate in the width direction. the light source includes a first edge light source disposed adjacent to one end of the first light source substrate in the length direction and disposed on one side of the first light source substrate in the width direction, spaced apart from the center of the first light source substrate in the width direction, and 4. The display device of claim 2, wherein, a second edge light source disposed adjacent to an end of the first light source substrate opposite the first edge light source in the length direction and disposed on a side of the first light source substrate opposite the first edge light source in the width direction, spaced apart from the center of the first light source substrate in the width direction. the light source includes a third offset illumination element disposed on the same line as the first offset illumination element and spaced apart from the first offset illumination element in the length direction of the first light source substrate, and 5. The display device of claim 2, wherein, a fourth offset illumination element disposed on the same line as the second offset illumination element and spaced apart from the second offset illumination element in the length direction of the first light source substrate. ​ 6. The display device of claim 5, wherein, The second bias lighting element is disposed between the first bias lighting element and the third bias lighting element along a length direction of the first light source substrate, and the fourth bias lighting element is disposed on a side of the third bias lighting element opposite the second bias lighting element along the length direction of the first light source substrate. 7.The display apparatus of claim 6, wherein The first bias lighting element and the third bias lighting element are spaced apart from each other by a first interval in the length direction of the first light source substrate, and The second bias lighting element and the fourth bias lighting element are spaced apart from each other by a second interval in the length direction of the first light source substrate and are respectively disposed at a center between the first bias lighting element and the third bias lighting element in the length direction of the first light source substrate.

8. The display device of claim 5, wherein, The interval between the first bias lighting element and the second bias lighting element is equal to the interval between the second bias lighting element and the third bias lighting element.

9. The display device of claim 8, wherein, The interval between the first bias lighting element and the second bias lighting element is less than or equal to half of the interval.

10. The display device of claim 5, wherein, The interval between the first bias lighting element and the second bias lighting element is less than the interval between the second bias lighting element and the third bias lighting element.

11. The display device of claim 10, wherein, The interval between the first bias lighting element and the second bias lighting element is equal to the interval between the third bias lighting element and the fourth bias lighting element. 12.The display apparatus of claim 1, further comprising a module substrate configured to transmit a signal to the first light source substrate and the second light source substrate, The first light source substrate is disposed on one side of the module substrate, and The light source module includes a third light source substrate disposed on a side of the module substrate opposite the first light source substrate. 13.The display apparatus of claim 12, further comprising a connector configured to electrically connect the module substrate and the light source module.

14. The display device of claim 2, wherein, A full width at half maximum of the light source is set to be greater than or equal to the interval between the first bias lighting element and the second bias lighting element.

15. The display device of claim 1, wherein, The light source includes: a light emitting diode; and an optical dome configured to cover the light emitting diode and made of silicone or epoxy resin.

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